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This study was to determine the effects on fermentation quality of alfalfa (Medicago sativa L.) silage. There were four experiments in this study with laboratory-scale silo. Experiment I:The dynamical fermentation quality of alfalfa and Italian ryegrass silages were studied. ExperimentⅡ:Effects of adding previously fermented juices (PFJ), molasses (M) and PFJ+M on the fermentation quality of alfalfa silage; ExperimentⅢ:The fermentation quality of alfalfa silage with Italian ryegrass mixed; ExperimentⅣEffect of wilted on fermentation quality of alfalfa silage.The results were as follows:Exp.1:The silos were opened on 0.5,1,1.5,2,3,5,7,14 and 30 days of ensiling in this experiment. The dynamic fermentation quality showed that the alfalfa silage had low fermentation quality during ensiling.In Exp.2:Alfalfa and Italian ryegrass were chopped and than were mixed in ratios of 2:8,3:7,4:6,5:5 (fresh weight basis; denoted H-1, H-2, H-3, and H-4, respectively) and ensiled in laboratory silos, they were opened on 1,3,5,7,14 and 30 days of ensiling. The mixed silage reduced pH and NH3-N/total N (P<0.05) during 30 days of ensiling, and increased the contents of LA and WSC (P<0.05). In the 30day ensiling process, the H-2 had high content of LA (84.12 gkg-1DM), lowest content of AN/TN and highest content of WSC (8.88 gkg-1DM), it suggested that H-2 was the best mixed rate.In Exp.3:The dynamic effect of fermentation was studied on alfalfa silage with adding Previously fermented juice (PFJ), Molasses (M) and PFJ+M. Based on the results the pH and AN/TN of alfalfa silage was significantly (P<0.05) decreased and the contents of LA and WSC significantly (P＜0.05) increased with M and PFJ+M treatments as compared with control, M and PFJ+M treatments can improve the quality of alfalfa silage. But single previously fermented juices additive did not improve silage quality in this experience.In Exp 4:There were four treatments:control and three wilted levels. All wilted treatment silage had higher pH of 4.8 during ensiling as compared with control, and the W-3 was lower than the other wilted silage (P<0.05). On 30th day, the pH value, LA, LA/AA of the control was significantly (P＜0.05) lower than all three wilted treatments, the AA content and AN/TN significantly (P<0.05) decreased in wilted silage treatments. During the 30 days of ensiling, the W-3 treatment (DM=412.7gkg-1 FW) was considered better than other treatments for the high LA content, lowest AN/TN and highest WSC content.
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